title: The relationship between self-determined motivation and physical activity in adolescent boys.
abstract: BACKGROUND
  Physical education (PE) lessons and leisure-time represent two important opportunities for adolescents to accumulate moderate-to-vigorous physical activity (MVPA).
  
  
  OBJECTIVE
  Framed by self-determination theory, this study investigated how much of the observed variation in adolescent boys' MVPA levels (during PE and leisure-time) was explained by individual- and class-level motivation.
  
  
  METHODS
  Cross-sectional design. Adolescent boys (N = 61, M = 14.36 years, SD = .48 years) completed motivation questionnaires and wore an accelerometer during a PE lesson and across 7 consecutive days.
  
  
  RESULTS
  Self-determined motivation toward PE predicted MVPA during PE lessons (R(2) = .31). Self-determined motivation toward leisure-time physical activity was positively associated with MVPA during leisure-time (R(2) = .08).
  
  
  CONCLUSIONS
  Findings support the tenets of self-determination theory and suggest that motivation may be an important correlate of adolescent boys' MVPA in PE lessons and during leisure-time. Also, results indicated that teachers' behavior may be an important determinant of MVPA in PE lessons, while individual motivation may be more important in leisure-time.
authors.affiliation: University of Western Sydney, Penrith, New South Wales, Australia.
authors.forename: Katherine B
authors.initials: KB
authors.lastname: Owen
authors.forename: Thomas
authors.initials: T
authors.lastname: Astell-Burt
authors.forename: Chris
authors.initials: C
authors.lastname: Lonsdale
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D003430:Cross-Sectional Studies; D006801:Humans; D007899:Leisure Activities; D008297:Male; D018670:Monitoring, Ambulatory; D009042:Motivation; D026684:Personal Autonomy; D010806:Physical Education and Training; D011795:Surveys and Questionnaires
keywords: Behavior; Leisure activities; Physical education and training; Schools